Bluebonnet NutritionL-Tryptophan Pharmaceutical Grade Free-Form Amino Acid 500 mg. - 60 Vegetarian Capsules Bluebonnet's Pharmaceutical Grade L-Tryptophan 500 mg Vcaps provide a highly pure, vegetarian source of free-form L-tryptophan called TryptoPure from Ajinomoto, the global leader in the production of pure, pharmaceutical- grade free-form amino acids in easy-to-swallow vegetable capsules for maximum assimilation and absorption. Bluebonnet L-Tryptophan is free of milk, egg, fish, crustacean shellfish, tree nuts, peanuts, wheat soybeans, yeast, gluten, barley, rice, sodium and sugar. Frequently Asked Questions Can I take my prescription medication and supplements? Please consult your doctor and pharmacist before combining prescription medications and nutritional supplements due to the lack of information about drug/nutrient interactions in the body. Can I take herbal supplements during pregnancy? Please consult your doctor and/or healthcare practitioner before combining prescription medications and herbal supplements due to the lack of information about drug/herb interactions in the body, especially during pregnancy. Is magnesium stearate a safe excipient? Magnesium stearate is a compound comprised of stearic acid (a naturally-occurring fatty acid) chemically bound to the element magnesium. It is used only when necessary, in very small quantities as a lubricating agent in the manufacture of supplements. Without such lubrication many ingredients would stick to the processing equipment, building up and interfering with the filling process. The first thing to realize is that stearic acid is very common in the human diet, comprising as much as 25 percent of total fatty acid intake and is considered a neutral fatty acid (i.e., does not increase LDL or decrease HDL cholesterol levels).